package com.nowcoder.community.entity;

/**
 * 封装分页相关的信息
 */
public class Page {
    // 当前页码
    private int current = 1;
    // 显示上限
    private int limit = 10;
    // 数据总数(用于计算总页数)
    private int rows;
    // 查询路径(用于复用分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1)
            this.current = current;
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >= 1 && limit <= 100)
            this.limit = limit;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 1)
            this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    // 获取当前页的起始行
    public int getOffset(){
        return (current - 1) * limit;
    }

    // 获取总页数
    public int getTotal(){
        if(rows % limit == 0)
            return rows / limit;
        return (rows / limit) + 1;
    }

    // 获取起始页码
    public int getFrom(){
        return Math.max(current - 2, 1);
    }

    // 获取结束页码
    public int getTo(){
        return Math.min(current + 2, getTotal());
    }
}
